Broadband coupling transducers for magneto-inductive cables

R R A Syms (1) , L Solymar (1) , I R Young (1)

1 Optical and Semiconductor Devices Group

A broadband resonant transducer capable of low-loss coupling between magnetoinductive waveguides and a real impedance is introduced. The transducer is an L-C circuit resonating at the resonant frequency of the elements forming the guide. However, the values of the components in the transducer are different, and chosen to obtain two separate nulls in reflection so that low reflection is obtained over a wide spectral range. The transducer can be incorporated into the MI waveguide itself, allowing a connection between a magneto-inductive cable and a conventional system to be made as a simple splice. The design is confirmed using two metre lengths of low-loss thin-film magnetoinductive cables formed using copper-clad polyimide and operating near 100 MHz frequency.

Mots clés: KEYWORDS Metamaterial; periodic structure; magneto-inductive wave PACS numbers 41.20.-q Applied classical electromagnetism 81.05.Zx New materials: theory; design and fabrication 84.30.Bv Circuit theory

R R A Syms, L Solymar, I R Young. Broadband coupling transducers for magneto-inductive cables. Journal of Physics D: Applied Physics, 2010, 43 (28), pp.285003. ⟨10.1088/0022-3727/43/28/285003⟩. ⟨hal-00569648⟩